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Hi List, Working on the large data frame (number of records=35000 and number of variables=160). Using redun() for dropping variables before using into model. V <- redun(~., data = data.frame, r2 = 0.8) It takes enormously high time for...

I have got solution using within function as below dd$Seg <- 1 dd <- within(dd, Seg[x2> 0 & x3> 200] <- 1) dd <- within(dd, Seg[x2> 100 & x3> 300] <- 2) dd <- within(dd, Seg[x2> 200 & x3> 400] <- 3) dd...

Hi All, I am working on the dataset in which some of the variables have more than one observations with outliers . I am using below mentioned sample script library(outliers) x1 <- c(10, 10, 11, 12, 13, 14, 14, 10...

Hi List, I am new to R, this may be simple. I want to store directory path as parameter which in turn to be used while reading and writing data from csv files. How I can use dir defined in...

When data contains both factor and numeric variables, how to get quartiles for all numeric variables? n <- 100 x1 <- runif(n) x2 <- runif(n) x3 <- x1 + x2 + runif(n)/10 x4 <- x1 + x2 + x3 + runif(n)/10 x5 <- factor(sample...

Hi, Thanks for the responce, code for each case is as: c_c_factor <- 0.001 min_obs_split <- 80 A) fit <- rpart(segment ~., method="class", control=rpart.control(minsplit=min_obs_split, cp=c_c_factor), data=Beh_cluster...

Hi Michael, Thanks for the help. Yes, I have gone through the document for ?outlier. As it removes one outlier at a time, being new to R, I was woondering is there any function available for removing multiple outliers whithout...

Dear List, Java Exception error while reading large data in R from DB using RJDBC. I am trying to read large data from DB table(Vectorwise), using RJDBC connection. I have tested the connection with small size data and was...

Dear All, I have got the limits for removing extreme values for each variables using following function . f=function(x){quantile(x, c(0.25, 0.75),na.rm = TRUE) - matrix(IQR(x,na.rm = TRUE) * c(1.5), nrow...

Hello List I am trying to create and assign variable names in loop, but not able to get expected variable names. Here is the sample code n = 10 set.seed(1) x1 = rnorm(n,0) x2 = rnorm(n,0) samp...

Hi Experts, This may be simple question, I want to create new variable "seg" and assign values to it based on some conditions satisfied by each observation. Here is the example: ##Below are the conditions ##if variable x2 gt 0...

I need to deciles data containing more than one variables using any one variable. I am using script below : id <-c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19...

Hi Experts, I am new to R, using decision tree model for getting segmentation rules. A) Using behavioural data (attributes defining customer behaviour, ( example balances, number of accounts etc.) 1. Clustering: Cluster behavioural data to suitable number of clusters 2...

Dear All, I am new to R, I have one question which might be easy. I have a large data with more than 250 variable, i am reducing number of variables by redun function as in the example below, n...

Hi List, I am reading table from postgres database into R session using RJDBC, table contains 150 columns and 200000 rows. Sample code is as below, which works fine with smaller tables. ######################################################################## db_driver <- mydir$db_driver db_jar_file...

Dear R-users, I would like to determine the probability of event at specific time using cox model fit. On the development sample data I am able to get the probability of a event at time point(t). I need...

Hi List, Being new to R, I am trying to apply boot.stepAIC() for Model selection by bootstrapping the stepAIC() procedure. I had gone through the discussion in various thread on the variable selection methods. Understood the pros and cons...

Dear List, Couple of issues while using functions from ?BCA? library: 1. I am trying to use ?lift.chart? function from ?BCA? library, but facing issues while using model where model formula is passed as formula object in glm. When...

Hi All, This might be simple question, I need to retrive data for modelling from the databases. Eveytime date values changes so I countnot fix date value in the code, it is required to pass as parameter. When I pass...

Hi, I am new to R for solving optimization problems, I have set of communication channels with limited capacity with two types of costs, fixed and variable cost. Each channel has expected gain for a single communication. I want to...